Basically, there are characters (called "legends") that can be purchased from the store using real money or in-game coins won from matches. Each character is unique and uses 2 weapons that each have it's own unique style.

There are combos you can do and so much stuff to learn. It's an amazing game - you should try it out. However, it's still in beta and constantly being improved.

Discuss away. I'm fresh to the game myself so any advice you have would be great.